Updated readme file to include sample for content colors and appearan…

…ce proxy additions.

README.md

@@ -48,13 +48,31 @@ override func viewDidLoad() {
     segmentedControl.underlineSelected = true
 
     segmentedControl.addTarget(self, action: #selector(TableViewController.segmentSelected(sender:)), for: .valueChanged)
+
+    // change some colors 
+    segmentedControl.segmentContentColor = UIColor.white
+    segmentedControl.selectedSegmentContentColor = UIColor.yellow
+    segmentedControl.backgroundColor = UIColor.black
 }
 
 func segmentSelected(sender:ScrollableSegmentedControl) {
     print("Segment at index \(sender.selectedSegmentIndex)  selected")
 }
 ```
 
+Using appearance proxy to change some colors
+
+```swift
+func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
+    let segmentedControlAppearance = ScrollableSegmentedControl.appearance()
+    segmentedControlAppearance.segmentContentColor = UIColor.white
+    segmentedControlAppearance.selectedSegmentContentColor = UIColor.yellow
+    segmentedControlAppearance.backgroundColor = UIColor.black
+
+    return true
+}
+```
+
 See the Demo project for example on how to use it.